Do I need a builder for a bathroom renovation?

The legal answer is no, in Queensland you do not need a licensed builder for a residential bathroom renovation. Individual trades (plumber, tiler, waterproofer, electrician) all have their own licensing and can work direct with you. The practical answer depends on whether you want to project-manage yourself or pay someone to do it.

The two main approaches

Approach 1, DIY project management

You engage each trade directly. You coordinate the schedule, the materials, the sequence. You pay each trade separately as their work is done. You deal with any issues between trades.

• Pros: Cheapest, no builder margin. You see exactly where the money goes. Direct relationship with each trade.
• Cons: Time-intensive (10-30 hours of coordination across the reno). Stress when things go wrong. Risk of trades blaming each other for problems.
• Best for: People with time, patience, building familiarity, and willingness to learn the sequence and coordination.

Approach 2, Builder or bathroom specialist company

You engage one company that runs the whole reno. They engage the trades (often their own crew plus subbies), coordinate the schedule, manage materials, handle issues. You pay them, they pay the trades.

• Pros: Single point of contact. They handle the coordination. Clear accountability. Often a fixed price with workmanship guarantee.
• Cons: Cost is 15-25% higher than DIY-PM (the builder margin). Less direct relationship with the trades doing the work.
• Best for: People without time for coordination, first-time renovators, anyone who wants single-point accountability.

What we offer

We do both. You can engage us as plumber only and coordinate with your other trades, or you can engage us to project-manage the full reno through our network of Gold Coast trades we have worked with for years. Either works, and we will tell you straight which approach suits your situation at quote stage.

If you DIY-PM, the trade sequence

1. Demolition / strip-out (sometimes the plumber, sometimes a separate demo crew)
2. Plumbing rough-in (us, including new drainage if relocating fixtures)
3. Electrical rough-in (electrician, in parallel with plumbing rough-in)
4. Plastering (if walls need patching after demo)
5. Waterproofing (separately licensed waterproofer, after rough-in passes pressure test)
6. Waterproofing cure (24-48 hours before tiling)
7. Tiling (the longest stage)
8. Joinery install (vanity, shaving cabinet, after tile cure)
9. Plumbing fit-off (tapware, basin, toilet, shower, bath)
10. Electrical fit-off (downlights, exhaust, GPOs)
11. Glazier (shower glass, mirror)
12. Painter (touch-ups)
13. Final cleaning and inspection

What can go wrong with DIY-PM

• Trade A finishes late, Trade B has already booked another job and cannot start when expected. 1-3 week delay.
• You forget to order tile / tapware / joinery early enough and the trade is ready before materials arrive. 1-4 week delay.
• An unexpected issue arises (asbestos discovered, drainage problem) and you do not know how to resolve. Some trades will help, others will charge for additional consult.
• One trade does work that another trade then has to redo (e.g. tiler covers a stop tap that we needed access to). Cost of the rework is on you.
• Quality issues between trades, who is responsible. Each trade blames the other.

Why builders cost more (and why it can be worth it)

A builder or bathroom specialist adds 15-25% margin on top of trade costs to cover their project management time, materials handling, risk on price overruns, and accountability for the finished result. They make the reno less risky for you, both timeline and quality.

For a $25,000 standard reno, the builder margin is $4,000-6,000. Compare that to the value of, your time saved (10-30 hours), reduced stress, faster timeline (good builders are practiced at avoiding delays), and someone to call if anything goes wrong post-reno.

For first-time renovators or busy households, the builder approach is often the better value despite the higher cost.

If you engage trades direct, choose well

For direct trade engagement:

• Plumber must be QBCC licensed. Gas work needs additional gas authorisation.
• Waterproofer must be separately licensed. Most bathroom failures trace back to waterproofing issues.
• Electrician must be QBCC licensed.
• Tiler does not need a Queensland licence but should have references and recent work to show.
• Joiner / cabinet maker not licensed but quality varies hugely.

Ask each trade for two recent references and follow up. The plumber-tiler-waterproofer interface is the most failure-prone. Good trades have worked together before and know each other's standards.

Bottom line

If you have time and patience, DIY project management saves real money. If you do not, engage a builder or bathroom specialist. Both approaches work. Either way, the trade selection (good plumber, good waterproofer, good tiler) matters more than which approach you pick.

The QBCC $3,300 threshold and what it actually means in practice

Queensland law has a specific threshold worth understanding carefully. Any single residential building job (one contract, one head contractor, one scope) over $3,300 including labour and materials must be performed by a QBCC-licensed contractor. For a bathroom reno, this almost always applies to the head contractor if you use one. But the threshold is on the contract value, not the total reno spend. If you engage trades individually (us for plumbing, a tiler for tiling, a waterproofer for waterproofing, an electrician), each contract is separately measured. A $9,500 plumbing scope from us is fine because we are QBCC licensed for plumbing. A $7,000 tiling scope from your tiler is fine because tiling does not require a QBCC builder licence in residential work. But if one person tries to coordinate the whole $30,000 reno without a QBCC builder licence, they are operating illegally and you have no recourse via QBCC dispute resolution if it goes wrong. We see this go bad most often when a homeowner hires an unlicensed mate-of-a-mate to project-manage cheap. When the waterproofing fails 18 months later, the unlicensed PM has no insurance, no QBCC backing, and the homeowner wears the full $15,000 to $25,000 fix cost. The PM disappears, the trades blame each other, and there is no head-contractor warranty to fall back on. If you DIY-PM yourself as the homeowner, the work is split across separately licensed trades and you are the legal head, which is allowed. If you pay someone else to project-manage the whole job, they must be a QBCC licensed builder or operate under the umbrella of one. There is no middle ground that is both cheaper and legal.

What the QBCC Home Warranty Insurance covers and when it matters

Any residential building work over $3,300 done by a licensed builder triggers mandatory QBCC Home Warranty Insurance. The builder pays the premium (typically 0.8 to 1.2 percent of contract value) and you get cover for non-completion, defective work, and subsidence-related issues for 6 years and 6 months on structural work, 12 months on non-structural. For a $30,000 reno, the insurance premium is roughly $240 to $360, usually included transparently in the builder quote. This insurance is a real reason builder route makes sense for first-time renovators. If the builder goes broke mid-job, QBCC steps in and finds another builder to finish at no extra cost to you. If defective waterproofing causes damage 4 years later, QBCC pays for the fix. DIY-PM does not get this insurance umbrella. Each individual trade carries their own public liability and workmanship guarantee, but there is no overarching policy if multiple trades collectively contribute to a failure (the classic case being a tiler-and-waterproofer combination where the membrane fails and they blame each other for prep work). For a Burleigh or Palm Beach reno on a $1.2 million home, the QBCC insurance peace of mind is genuine value. For a Robina townhouse reno on a $650,000 home where the owner is hands-on and the scope is modest, DIY-PM with strong individual trade selection works fine and saves the $4,000 to $6,000 builder margin. The insurance value scales with the property value and the consequence of failure.

The grey zone: kitchen renovators and bathroom specialists who are not licensed builders

The Gold Coast has dozens of bathroom and kitchen specialist companies that look like builders but operate under a different legal model. Some are properly QBCC-licensed builders trading under a kitchen-and-bath brand. Others are essentially sales-and-project-coordination shops who subcontract every trade and have no builder licence themselves. The second type often skirts the $3,300 threshold by writing your job as multiple separate contracts: one for design, one for joinery supply, one for tiling supply, one for plumbing, one for electrical. Legal on its face but messy and frequently disputed when something goes wrong because no single party holds end-to-end responsibility. Ask any bathroom specialist for their QBCC licence number before signing anything. Check it on the QBCC public register at qbcc.qld.gov.au. If they hold a builder licence (BLD or QBC class), you have full consumer protection. If they hold only a trade contractor licence (plumbing, joinery), they cannot legally head-contract over $3,300 as a single job and you should ask exactly how they structure the contract. Reputable specialists are upfront about this and have a clear answer. Operators who get evasive about their licensing structure are signalling something worth heeding. Some of the best-quality bathroom specialists in the Burleigh-Mermaid Waters corridor are run by ex-builders who carry full licensing and offer genuinely managed renos with QBCC backing. Some of the cheapest quotes you will see come from coordination shops with no licence and minimal accountability when the job goes sideways.

What we tell our renovation customers, the three-way honest advice

For most Gold Coast bathroom renos in the $18,000 to $45,000 range, our honest advice runs three ways depending on your situation. First, if you have done a reno before, know how to read a quote and spot tradeoffs, and have flexible time to coordinate, DIY-PM with us as plumber is the right model. Cheapest option, full control, you save the builder margin, and you keep direct relationships with every trade for any future work or warranty claims. Best for owner-builders, second-home renovators, and trades-adjacent professionals. Second, if it is your first reno, you both work full time, and the bathroom is one of two in the house (so there is no fallback if it runs over time), engage a QBCC-licensed builder or properly-licensed bathroom specialist. The 15 to 25 percent premium buys you sleep at night, single point of contact, and the QBCC insurance umbrella. Best for time-poor families, anxious first-timers, and high-value homes where the consequence of failure justifies the premium. Third, if you have one cooperative trade you trust deeply (often the plumber or the tiler) and the scope is well-defined, sometimes that trade can informally lead-coordinate the job for a small markup ($1,500 to $3,000) without taking the legal head-contractor role. We do this occasionally with long-term customers but only when scope is well-defined and we know the other trades personally so the coordination friction is minimal. Pick the model that matches your situation honestly, not the cheapest model by default. The reno that fails is almost always the one where the owner chose the cheapest path without matching it to their actual circumstances.